Update configuration.md
Update configuration.md

Tweak and simplify language re: `keep_files` and `destination` directory.
sanxore/sanxore.github.com,superve/jekyll,jeffkole/jekyll,jaybe-jekyll/jekyll,jmknoll/jekyll,mrb/jekyll,Teino1978-Corp/jekyll,mrb/jekyll,ZainRizvi/jekyll,garvitr/jekyll,julienbourdeau/jekyll,saitodisse/jekyll,thetaxman/jekyll,hubsaysnuaa/jekyll,alex-kovac/jekyll,ZDroid/jekyll,desidude03/jekyll,winndows/jekyll,rebornix/jekyll,wadaries/jekyll,AtekiRyu/jekyll,LeuisKen/jekyllcn,omeripek/jekyll,tomjohnson1492/jekyll,iRoxx/jekyll,drobati/jekyll,pmarsceill/jekyll,bsmr-ruby/jekyll,ramoslin02/jekyll,htmelvis/jekyll,jmepg/jekyll,trungvothanh/jekyll,ReachingOut/jekyll,tylermachen/jekyll,mixxmac/jekyll,foocoder/jekyll,fengsmith/jekyll,chinayin/jekyll,xiaoshaozi52/jekyll,chrisfinazzo/jekyll,QuinntyneBrown/jekyll,tomjohnson1492/jekyll,tugberkugurlu/jekyll,daniel-beck/jekyll,rlugojr/jekyll,supriyantomaftuh/jekyll,rongl/jekyll,jmptrader/jekyll,hiteshsuthar/jekyll,larryfox/jekyll,sanxore/sanxore.github.com,tomjohnson1492/jekyll,egobrightan/jekyll,tomjohnson1492/jekyll,Teino1978-Corp/Teino1978-Corp-jekyll,dansef/jekyll,jekyll/jekyll,MjAbuz/jekyll,angeliaz/jekyll,alfredxing/jekyll,hiteshsuthar/jekyll,tillgrallert/jekyll,gkunwar/gkunwar.github.io,krishnakalyan3/jekyll,AaronSikes/jekyll,EddieDow/jekyll,zhangkuaiji/jekyllcn,noikiy/jekyll,LeuisKen/jekyllcn,chiyodad/jekyll,dansef/jekyll,xiaoshaozi52/jekyll,fabulousu/jekyll,ducktyper/jekyll,hiteshsuthar/jekyll,kuangyeheng/jekyll,kimeng/jekyll,digideskio/jekyll,ryanshaw/jekyll,xantage/jekyll,0x00evil/jekyll,Tiger66639/jekyll,nickg33/jekyll,harrissoerja/jekyll,christophermanning/jekyll,greent2008/jekyll,xiebinhqy/jklly_china,alihalabyah/jekyll,mrb/jekyll,rebornix/jekyll,princeofdarkness76/jekyll,julienbourdeau/jekyll,thejameskyle/jekyll,MauroMrod/jekyll,FlyingWHR/jekyll,tamouse/jekyll,jmhardison/jekyll,QuinntyneBrown/jekyll,krishnakalyan3/jekyll,ls2uper/jekyll,larryfox/jekyll,backendeveloper/jekyll,adilapapaya/jekyll,royalwang/jekyll,CorainChicago/jekyll,richsoni/jekyll,thetaxman/jekyll,ryanshaw/jekyll,gencer/jekyll,LuoPX-15510486969/jekyll,kuangyeheng/jekyll,18F/jekyll,howkj1/jekyll,iRoxx/jekyll,teju111/jekyll,winndows/jekyll,dangaute/eng,iRoxx/jekyll,gencer/jekyll,Wirachmat/jekyll,matuzo/jekyll,zsyed91/jekyll,codeclimate-testing/jekyll,jeffkole/jekyll,daniel-beck/jekyll,doubleday/jekyll,abhilashhb/jekyll,jaybe-jekyll/jekyll,krahman/jekyll,chiyodad/jekyll,larryfox/jekyll,liukaijv/jekyll,chrisfinazzo/jekyll,nickg33/jekyll,Tyrion22/jekyll,Tyrion22/jekyll,chinayin/jekyll,nateberkopec/jekyll,AaronSikes/jekyll,jekyll/jekyll,superve/jekyll,daniel-beck/jekyll,mixxmac/jekyll,Teino1978-Corp/Teino1978-Corp-jekyll,gkunwar/gkunwar.github.io,pmarsceill/jekyll,goragod/jekyll,wentixiaogege/jekyll,zhangkuaiji/jekyllcn,rongl/jekyll,stomar/jekyll,yihangho/jekyll,Strangehill/jekyll,stomar/jekyll,princeofdarkness76/jekyll,martynbm/jekyll,Strangehill/jekyll,ls2uper/jekyll,ducktyper/jekyll,gkunwar/gkunwar.github.io,foocoder/jekyll,desidude03/jekyll,xcatliu/jekyllcn,rovrevik/jekyll,nemotan/jekyll,shuber2/jekyll,egobrightan/jekyll,Strangehill/jekyll,Wirachmat/jekyll,cyberid41/jekyll,stevecrozz/jekyll,likong/jekyll,tugberkugurlu/jekyll,CPVPLachlan/CPVP-Blog,fulldecent/jekyll,jekyll/jekyll,nickg33/jekyll,goragod/jekyll,harrissoerja/jekyll,ajhit406/jekyll,dezon/jekyll,rasa2011/rasa2011.github.io,jaroot32/jekyll,thejameskyle/jekyll,nathanhorrigan1/webdeveloper,AnanthaRajuC/jekyll,PepSalehi/jekyll,jmhardison/jekyll,jekyll/jekyll,CorainChicago/jekyll,johnnycastilho/jekyll,ReachingOut/jekyll,Teino1978-Corp/jekyll,chrisfinazzo/jekyll,fabulousu/jekyll,Kinghack/kinghack.github.com,sasongkojati/jekyll,0x00evil/jekyll,EddieDow/jekyll,tobscure/jekyll,digideskio/jekyll,alex-kovac/jekyll,harrissoerja/jekyll,krishnakalyan3/jekyll,pheuko/jekyll,digideskio/jekyll,backendeveloper/jekyll,mnuessler/jekyll,FlyingWHR/jekyll,m2candre/jekyll,garvitr/jekyll,nemotan/jekyll,ZDroid/jekyll,superve/jekyll,dangaute/eng,jmknoll/jekyll,ZainRizvi/jekyll,tareq-s/jekyll,xtymichael/jekyll,m2candre/jekyll,richsoni/jekyll,CheekyFE/jekyll,tylermachen/jekyll,anthonyrosengren/grasshoppergathering2.github-io,cyberid41/jekyll,royalwang/jekyll,rasa2011/rasa2011.github.io,thetaxman/jekyll,christophermanning/jekyll,hubsaysnuaa/jekyll,AnanthaRajuC/jekyll,ducktyper/jekyll,Tiger66639/jekyll,ryanshaw/jekyll,brint/jekyll,fengsmith/jekyllcn,pheuko/jekyll,aarvay/jekyll,alfredxing/jekyll,penchan1218/jekyllcn,tomasdiez/jekyll,anthonyrosengren/grasshoppergathering2.github-io,julienbourdeau/jekyll,tareq-s/jekyll,rasa2011/rasa2011.github.io,ZainRizvi/jekyll,derekgottlieb/jekyll,yihangho/jekyll,zsyed91/jekyll,tamouse/jekyll,xantage/jekyll,SQS2/Test,richsoni/jekyll,penchan1218/jekyllcn,naughtyboy83/jekyll,rovrevik/jekyll,Strangehill/jekyll,rovrevik/jekyll,ajhit406/jekyll,fengsmith/jekyll,ewinkler/jekyll,tobscure/jekyll,QuinntyneBrown/jekyll,gaosboy/jekyll,jmptrader/jekyll,vidbina/jekyll,aarvay/jekyll,wadaries/jekyll,vcgato29/jekyll,oresmus/jekyll,fabulousu/jekyll,chrisfinazzo/jekyll,gencer/jekyll,desidude03/jekyll,angeliaz/jekyll,getandpost/jekyll.github.io,hartmel/j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